feat(develop-docs): Add alternative masking strategies

[philprime]

This PR contains a document and work-in-progress files from prototyping alternative masking approaches.

We are only going to merge the document develop-docs/VIEW_MASKING_STRATEGIES.md and all other files are just for context.

Please only review the document

#skip-changelog

Closes #6861

[github-actions]

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📖	Do not forget to update Sentry-docs with your feature once the pull request gets approved.

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[codecov]

⚠️ JUnit XML file not found

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[philprime]

Also consider these approaches:

• Defensive-programming approach, masking everything unless there is a 100% certainty an area can be unmasked safely (safest but most complicated approach)
• Rebuilding a wireframe using colored rectangles based on the view hierarchy, without calling draw methods (should also result in performance improvement)
• Draw the view into a PDF context, then use PDF manipulation to remove all images (probably not possible because the rendered view is an image by itself)

[philipphofmann]

Thanks for the great summary

[philipphofmann]

Thanks, LGTM